When the sweat from your anus and the sweat from your genitale mix together in your gunch.
Man this heat is really giving me some bum swish.
A word some parents teach their kids to refer to male genitalia so that they don't go around using the real word
"Mommy, why do boys have peepee bums and girls don't?"
The act of drinking until drunkenness on a completely empty stomach.
No food, but a bottle of wine = bum drunk.
The act of smearing your butt crack and the pubic hair within in salad cream in an attempt to lube it up for penetration.
If salad cream can not be found then it is acceptable to substitute mayo/light mayo.
Yo man, I can't believe I got a bum salad last night, my ass is "cold-sore" now.
When a homeless person sits on your face.
Last night I got to drunk and went out and found a dirty homeless guy to bum board me. I always get pinkeye after a good Bum boarding.
A jiggly, saggy, and flubby bum. Most wannabe skinny girls have them.
Wow, look at her jelly-bum!
Yea, it’s really saggy today...